In regards to Uranium One:

I found Calico Corps yearly reports. Calico was the company that refined the uranium from Wyoming.

https://s3-us-west-2.amazonaws.com/assets-us-west-2/annual/Cameco_2013_Annual_Report.pdf

End of Page 8:

"""Our ownership of NUKEM GmbH (NUKEM) provides us with

access to one of the world’s leading traders of uranium and

uranium-related products. We

acquired NUKEM in January 2013."""

So it seems the next in line is the trader who sold it.